Crank-case-ventilator valve



Feb. 4, 1930. c. H. DEARBORN CRANK CASE VENTILATOR VALVE Filed Oct. -19, 1927 2 Sheets-Sheet Illini! Feb. 4, 1930. c. H. D'EARBORN` 1,746,215

CRANK cAsE VENTILATR VALVE Filed ook. 19. .1927 z sheets-snee: 2

@Mfg

@HIM/nego,

Patented Fel). Y

PANY, on ILINT, MICHIGAN, a COMPANY oF MICHIGAN loIyIN'roN H. DEARBOHMOF HAMPTON, VIRGINIA, AssIGNonl'ro aosPA 7 cnANKLvcAsEfvnNrIIAToR VALVE i *fnppiicationiiled october .19, i927. v 'serial N6; 227,235,

' j This invention relates tocrankcasu'e'venti.-

lation and has to doparticularlyeewith ,cranke r'ca'seventilation for an internal combustion engine of the type usedjin an vautomotive ve- .hicle' l. 7^: t ,y A. Y. It s'an object of the invention to provide lag newandimproved crankcase Ventilating system which is operated by the current of air resulting from the," movement of the 'car or 10 moving rearward from the fan, lIthasbeen proposed,vbefore my invention, to connect the cranklcase with a'current ofia'i'r in such away asfto permit that current of v'air to exercise? l suctionfon the contents of the crankcase This 1- '175 suctionhas thefeifect of removing the more volatile of the contents othe'crankease such as gasolineand watervapors which may have enteredk between .the walls of the cylinders Y ,Y A and pistons. Such a Ventilating'v device, if '20 constructed to be efficient -at low engine speeds, may operate.disadvantageously' at.

higherspeeds. Aty high speeds the greater jair kcurrent lexercises' greater v suction Aupon ,the contentsy of the crankcase andmaytakethere-y Vfrom not only the more volatile. substances but tine particles of the less volatilelubricatingmedium. LThis is especiallyflikely to kocr` v Ycur in hot weather when the motor is quiteVv hot. Undersuchco'n'ditions butlittle ventila tion isneeded in thecrankcase asfthe diluents are then vaporized.'

j v'It san voloject'of my invention to avoid suchv disadvantages while retaining al1 the advan- V fafsi tages of an lefficient crankcase ventilating sysj tem operating on the prineiple'o suction produced bya current o air.' More specifically it is an objectof this 'invention to provide an improvedvand simplified controlling means Other objects and' advantages of-'th'e'invenltion willappear inthe course of the follow ying description, taken in'connectioniwith the accompanying drawing and appended claims.

y 40T forsuch a Ventilating system. f

'li In the drawingz" f and with .parts broken away;

away.

viewof the valve mechanism,

Figure 3a 1s ure 3.

of my invention.

-Figure'' Figure 5. Figure 7 is a section on .the yline V'7i-7 of Figure 5;

showing a modiedform ofregulating valve;

Figure 9de-aside View with parts broken l away, ShOWng a still further modification of my lnvention. f f

Figure 10 is a reary view ofthe structure j, v

shown in Figure 9.

rReferring to the drawing, I have shown in' Figureilfa section'ofia conventional vertical usedin anautomotve vehicle.' Threaded in an'v aperture in the crankcase 12 is an exterl nally and internally threaded valve casing 14 in which is threaded the:l valve stein supporting plug `16 which is provided with a1 eenltral opening in which the valve stem 18 is-ver` tically reciprocable. A valve QOis provided i on the end of the stem 18 and isjbevelled to I lit in lthe bevelled vvalve* seat 22', being nor-- mallyvheldl unseated in the position illustrated' in Flgure 3 bythe coil springl24= surrounding thev valve stem between the ValVeQOandplug V16.V Downward movement ofthe valvestemr 18 islimited by pin 1'9 in the valve stem. VThe Y plug vis "perforated in y' any desired. manner, such as beingslotted, as shownin Figurefca,

iny orderto permit thefpassageof air vthrnighf the valve casing 14. I-thus providea valve orf damper in the connection between; the

'Y Figure 3 is an enlarged sectional:A detail *A 5"() a Seannv on um' linee er ling-Q j lFigure 4 is a sideviewfof a modified fform` HK PLUG ,CoM-V Figure 1 isa front view,fpa rtly insectionv j Figure 2' is aside elevationgpartly `broken n l vFigure 6'is ar section on the linejjf-G f: l

' :of air from the crankcase.

crankcase and the venturi described below.

Connected Vwith the valve casing 14 on Vthe outside ofthe cranlcase is the venturi or suction device. inlet having an enlarged open end 26 and a restricted portion 28 fixed in the enlarged 'upper end 3() of the outlet pipe 32 which is supported in a bracket 34 fixed to the side of the crankcase. The enlarged end is connected by a pipe 36 with the cranlrcase, the flanged lower end of the pipeV 36being fixed over the .valve casing 14 by the clamping nut 38. p

During the forward movement of the vehicle a blast of air passes in through the en larged opening 26 and'restricted portion 28 into the enlarged portion 30 and out through the rearwardly extending pipe 32. This cre- 'y ates a region of low pressure Within theenlarged portion 30 with the result that air is drawn through the pipe 36 from the crankcase. As the blast of air increases, ydue to arr increase 1n speed of the car and/or thevfan,V

the suction within the enlarged portion 80 increases and tendsto cause an increased flow This increased flow of air causes the valve 2O to move against thetension of the spring 24 toward closed position, thusreducing the effective size of the aperture and limiting the current of air from the crankcase throughthe Ventilating device. The damper or valve in the connec-V tion between the cranlcase and venturi Yis thus `controlled by the passage of air through the venturi. i u

In the modified form of my invention as shown in Figures 4 to 7 inclusive, the venturi, comprising the cone-shaped inlet 40 and outlet pipe 42, is connected by means of the elbow joint 44 with the crankcase12, the hori-y zontal portion of the joint 44 being supported in an aperture in the crankcase l2 while the verticalportion extends within the enlarged portion 43 of the pipe 42. The valve is supported in the vertical portion ot jointV 44 and comprises a cylindrical element 46 carrying an annular flange 48. A. screen is fixed over the lower end of cylindrical element 46 and vertically movable within said element between the screen 50 and flange48 is the star-shaped valve 52. As the rate of flow of air from the crankcase throughtheelbow joint 44 increases the star-shaped valveV` 52 is moved upward and cuts down on and limits passage of air from the crankcase to the venturi. n,

The structure of the modication shown in Figure 8 is the same as that shown in Figures 4 to 7 inclusive except in the speciic structure of the damper. As shown in Fig` ure 8 a baille 60 is provided in the elbow joint and vertically swingable adjacent thereto is a disk valve 62 provided with an aperture 64. The disk 62 swings upward as theVc-ur-Y rent increases and acts. as a damper.

This device comprises anV In the modification shown in Figures 9 and l0, a slightly modified form of venturi is provided, comprising a cone-shaped inlet connected with an enlarged substantially spherical element 72 Vwhich in turn has connected therewith the outlet pipe 74. A pipe 76 connects the element 72 with the .cranlcase Pivoted over an opening in the element 72 and normally spring pressed in closed position by means of coil spring 77 is a disk valve 78.

` Thisvalve is directly'in the way ofthe blast VVl. An internal combustion engine having Va crankcase provided with an air inlet, ahsuction connection to the crankcase for applying suction thereto to produce a flow of air therethrough, and means in said suction connection operated by increase of suctionl for closing said connection to yreduce the vacuum applied to the crankcase.' v n 2.l An :internal combustion enginey having a crankcase provided with an air inlet', an

aspirator for applyingy suction to. the crank' case, anda valve 1n said aspirator operated by increase in suction to cut down the capacity of the aspirator for the conductionv of air therethrough from the crankcase.

3. An internal combustion engine having crankcase provided AwithY an air inlet, an air outlet, means for directing a flow ofair across said outlet to produce an aspirating action thereon, and means associated with said outlet responsiveto increased suction thereon for decreasing the capacity of said outlet.

' 4. Anfinternalcombustion engine having a crankcase provided with an air inlet, an air outlet, means'for directing aow of air past saidoutlet to'produce an aspirating effect thereon to remove vapors from the crankcase, andra valve vin said outlet responsive to suc. tion for reducing the capacityof'said outlet.V as t-he engine suctionincreasesfand means.

for normally maintainingsaid valve in full open position.

5. An internal combustion engine having ay crankcase provided with'an air inlet, an outlet tube, an air blast operated aspirator arranged to direct a blast of air across said outlet'tube to produce an Y aspiratingV effect thereon to withdraw vapors from the crankcase,a valve in said outlet tube, a spring for urging the` valve to open position, said valve being moved toward closing position by increase in suction produced by said aspiraton 6.' Anvengine fitting comprising a tubular member adapted to be fitted.V in an'opening in the'engine crankcase, va suction operated valve in said tubular member,r and means for norf iv'v Dually-maintaining the'valve in open position. V Y

7; An engine fittingvv comprising avtubular member adapted to be fitted in an opening in an engine orankcase, a guide in said member .apertured for the passageof air, and a valve I` 10 slidably mounted'in saidV guide arranged to shut off communication throughV Saidv pipe,

and a spring normally urg'ingthevalye away y y from closing position.

In testimony whereof I afixnmy signature.

i CLINTON H. DEARBORN.

fso 

